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Intake&Exhaust fasteners to A series cylinder head
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Sorting thru hardware for the intake and exhaust nuts&washers. The top center stud has a different diameter washer for the exhaust compared to the other thick washers. Is it a different shape or type of washer? Also does the intake have a flat washer or only a nut and lock washer. I think I have everything else correct. Thanks.

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Posted on: 4/12 22:25
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Re: Intake&Exhaust fasteners to A series cylinder head
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Ah fascinating. Datsun used several length studs over the years

the good news is that the washers have been the same
Quote:
The top center stud has a different diameter washer for the exhaust compared to the other thick washers. Is it a different shape or type of washer? Also does the intake have a flat washer or only a nut and lock washer.
The four bottom washers are the yoke type (bottom of intake manifold/shared exhaust manifold)
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08911-10810 NUT CYLINDER HEAD TO MANIFOLD (9)
08915-13810 WASHER-LOCK (5) for upper studs
14037-32200 YOKE-MANIFOLD (4) [large washers]

M8 studs & nuts with Yoke washers (Yoke Washers are only used on the bottom row of studs), 2012 seems like years ago

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jpg  2012-03-07141307.jpg (61.47 KB)
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jpg  2012-03-07141256.jpg (53.99 KB)
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Posted on: 4/12 23:11
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Re: Intake&Exhaust fasteners to A series cylinder head
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Quote:
The top center stud has a different diameter washer for the exhaust compared to the other thick washers. Is it a different shape or type of washer?
Supposed to be the same for all the gasket bolts

* All nine studs use the same M8 nuts (diagram #8)
* top five studs use the same M8 lock-washers (diagram #9)
* bottom four studs use Yoke only (diagram #10, no lock washer)

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png  005-01b.png (60.21 KB)
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Posted on: 4/12 23:34
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Re: Intake&Exhaust fasteners to A series cylinder head
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Thanks DD. The top right and top left exhaust studs show an impression on the manifold of this same size yoke washer. That just gets a lock washer and nut? And the same with the top center stud, lock washer and nut only? This would explain why I am short on these yoke washers for 2 motors.

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jpg  cylinder.head.nuts.washersR.JPG (141.09 KB)
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Posted on: 4/12 23:55
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Re: Intake&Exhaust fasteners to A series cylinder head
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someone has put them out of order. I've never seem the Yoke used for any top stud, but only used where the intake/exhaust stud are shared

iNteresting that your cylinder head is drilled for both old and new bolt patterns (empty stud hole between the intake ports). What are the cast marks on the head?

Here's the newer A-series version which uses 11 studs instead of 9 (Diagram and Part Nos. from B310/Datsun 210)
* Nuts changed from Low-carbon steel to Medium carbon steel (11 required)
* 14002E YOKE 14037-32200 replaced by 14037-N3600 buy at Nissan $2.08 each (for late A15 is 14037-P7100 discontinued. Early A15 used same as the others, difference unknown)
* Top outside washers (14002F) changed to a plain washer 14037-E3000 instead of lock-washer (two required)
* Other washers are same lock-washers as before (five top washers)

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png  A14-001-01.png (46.05 KB)
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Posted on: 4/13 0:30
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Re: Intake&Exhaust fasteners to A series cylinder head
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H95 head. So what does that mean with having both bolt patterns?

Posted on: 4/13 6:02
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Re: Intake&Exhaust fasteners to A series cylinder head
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early heads had the 9-bolt manifold gasket pattern
later they used the 11-bolt pattern

what it means is if you can use aftermarket manifolds
* some heads were drilled and tapped for both patterns but the stud hole was empty
* Datsun Competition explained how to drill the stud hole if necessary

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jpg  982_.jpg (23.99 KB)
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Posted on: 4/13 7:07
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